Type-1 HARQ-ACK codebook generation for multi-PDSCH scheduling

This application is a U.S. National Stage Filing under 35 U.S.C. 371 from International Application No. PCT/US2022/024994, filed Apr. 15, 2022 and published in English as WO 2022/221647 on Oct. 20, 2022, which claims priority to: U.S. Provisional Patent Application Ser. No. 63/176,026, filed Apr. 16, 2021, U.S. Provisional Patent Application Ser. No. 63/185,256, filed May 6, 2021, U.S. Provisional Patent Application Ser. No. 63/186,548, filed May 10, 2021, U.S. Provisional Patent Application Ser. No. 63/186,640, filed May 10, 2021, U.S. Provisional Patent Application Ser. No. 63/217,459, filed Jul. 1, 2021, which are incorporated herein by reference in their entireties.

Embodiments pertain to wireless communications. Some embodiments relate to wireless networks including 3GPP (Third Generation Partnership Project) and fifth-generation (5G) networks including 5G new radio (NR) (or 5G-NR) networks. Some embodiments relate to sixth-generation (6G) networks. Some embodiments relate to multi-transmission time interval (TTI) scheduling of physical downlink shared channels (PDSCHs). Some embodiments relate to Hybrid Automatic Repeat Request (HARQ) Acknowledgement (ACK) codebook generation.

Mobile communication has evolved significantly from early voice systems to today's highly sophisticated integrated communication platform. The next generation wireless communication system, 5G, or new radio (NR) will provide access to information and sharing of data anywhere, anytime by various users and applications. NR is expected to be a unified network/system that target to meet vastly different and sometime conflicting performance dimensions and services. Such diverse multi-dimensional requirements are driven by different services and applications. In general, NR will evolve based on 3GPP LTE-Advanced with additional potential new Radio Access Technologies (RATs) to enrich people lives with better, simple and seamless wireless connectivity solutions. NR will enable everything connected by wireless and deliver fast, rich contents and services.

On issue with 5G NR systems is HARQ-based PSDCH transmissions, particularly for higher-carrier frequency operations (i.e., carrier frequencies above 52.6 GHz) since larger subcarrier spacings (SCSs) are used with a shorter slot duration.

The following description and the drawings sufficiently illustrate specific embodiments to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. Portions and features of some embodiments may be included in, or substituted for, those of other embodiments. Embodiments set forth in the claims encompass all available equivalents of those claims.

Some embodiments are directed to hybrid-automatic repeat request (HARQ) based PDSCH transmission. Some embodiments are related to multi-transmission time interval (TTI) scheduling of multiple physical downlink shared channels (PDSCHs). Some embodiments are directed to Type-1 hybrid-automatic repeat request acknowledgement (HARQ-ACK) codebook generation. These embodiments are described in more detail below.

th Some embodiments are direct to a user equipment (UE) configured for operation in a 5generation (5G) new radio (NR) system (5GS) (5G NR). In these embodiments, the UE may be configured to detect a downlink control information (DCI) format. When the DCI format is a multi-transmission time interval (TTI) DCI scheduling multiple physical downlink shared channels (PDSCHs), the UE may determine a set of downlink (DL) slots for the multiple scheduled PDSCHs and a set of a Start and Length Indicator Values (SLIV) for the DL slots based on configured slot timing values (K1) and a configured time domain resource allocation (TDRA) table. The UE may also determine candidate PDSCH reception occasions corresponding to an uplink slot for a HARQ-ACK. The UE may also encode the HARQ-ACK for transmission in the uplink slot. In these embodiments, the HARQ-ACK may comprise a Type-1 HARQ-ACK codebook generated based all the DL slots of the set of DL slots and the set of SLIVs for the DL slots. These embodiments are described in more detail below.

In these embodiments, the UE may be configured for HARQ based PDSCH transmission. In these embodiments, the candidate PDSCH reception occasions correspond to a position in the HARQ-ACK codebook to transmit HARQ-ACK feedback for the related potential PDSCH(s). In these embodiments, for each DL slot, one or more candidate PDSCH reception occasions may be determined, although the scope of the embodiments is not limited in this respect.

In some embodiments, the UE is configured to detect the multi-TTI DCI when operating at subcarrier spacings (SCS) of 120 kHz, 480 kHz and 960 kHz with shorter slot durations (i.e., at higher-carrier frequencies (i.e., carrier frequencies above 52.6 GHz)). In these embodiments, a gNodeB (gNB) does not configure the UE with a multi-TTI DCI when operating at lower subcarrier spacings (i.e., 60 kHz). In these embodiments, multiple PDSCHs/PUSCHs may be scheduled by a single DCI. This avoids the need for UE to monitor every slot for a PDCCH scheduling PDSCH/PUSCH since it may not be feasible for the UE to monitor and decode due to very short slot duration for higher SCS values such as 480 kHz and 960 kHz. In these embodiments, when the UE is configured with a multi-slot PDCCH monitoring span, the UE is not required to monitor every slot for a physical downlink control channel (PDCCH), although the scope of the embodiments is not limited in this respect.

In some embodiments, to determine the DL slots for the set, the processing circuitry is to consider all combinations of the configured slot timing values (K1) and the SLIVs of all rows of the configured TDRA table. In some embodiments, the UE may be configured to decode one or more PDSCHs in the DL slots of the set to generate the Type-1 HARQ-ACK codebook, although the scope of the embodiments is not limited in this respect.

In some embodiments, the configured slot timing values (K1) are received in the DCI format and the SLIVs indicate a start symbol and a number of consecutive symbols within DL slots of the set. In these embodiments, a SLIV is the Start and Length Indicator for a time domain resource allocation for a PDSCH that defines start symbol and number of consecutive symbols for PDSCH allocation (e.g., see TS 38.214), although the scope of the embodiments is not limited in this respect.

In some embodiments, to determine a set of SLIVs for a DL slot, the processing circuitry is to include a SLIV of a row in the TDRA table if the SLIV can be scheduled with one of the configured slot timing values (K1) so that the SLIV is mapped to the DL slot. In some embodiments, the UE may be configured to exclude a SLIV, from the set of SLIVs, for a DL slot, if the SLIV overlaps with an uplink (UL) symbol in the DL slot (i.e., according to the semi-static TDD UL-DL configuration), although the scope of the embodiments is not limited in this respect.

In some embodiments, the candidate PDSCH reception occasions for a DL slot of the set are determined from the set of SLIVs for the DL slot. In these embodiments, the candidate PDSCH reception occasions may correspond to positions in the HARQ-ACK codebook, although the scope of the embodiments is not limited in this respect.

In some embodiments, the UE may determine a single (i.e., only one) candidate PDSCH reception occasion for a DL slot if the set of SLIVs for the DL slot includes at least one SLIV that is not overlapping with an UL symbol in the DL slot according to a semi-static TDD UL-DL configuration. In these embodiments, only one candidate PDSCH reception occasion is determined for a DL slot. In these embodiments, the TDD configuration may be semi-statically signaled to the UE by the gNB, although the scope of the embodiments is not limited in this respect.

In some embodiments, each of the scheduled PDSCH transmissions are scheduled by the DCI format to have one or more transport blocks (TBs) in different DL slots, although the scope of the embodiments is not limited in this respect.

In some of these embodiments, the Type 1 codebook may be a fixed size Codebook provided by the gNB via RRC Signaling (Semi static). A Type 2 Codebook may have a dynamic size and may change according to resource allocation (Dynamic), although the scope of the embodiments is not limited in this respect. In some embodiments, the processing circuitry may comprise a baseband processor, although the scope of the embodiments is not limited in this respect.

th Some embodiments are directed to a non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a user equipment (UE) configured for operation in a 5generation (5G) new radio (NR) system (5GS) (5G NR). In these embodiments, the processing circuitry may be configured to detect a downlink control information (DCI) format. When the DCI format is a multi-transmission time interval (TTI) DCI scheduling multiple physical downlink shared channels (PDSCHs), the processing circuitry may determine a set of downlink (DL) slots for the multiple scheduled PDSCHs and a set of a Start and Length Indicator Values (SLIV) for the DL slots based on configured slot timing values (K1) and a configured time domain resource allocation (TDRA) table. The processing circuitry may also determine candidate PDSCH reception occasions corresponding to an uplink slot for a HARQ-ACK. The processing circuitry may also encode the HARQ-ACK for transmission in the uplink slot. In these embodiments, the HARQ-ACK may comprise a Type-1 HARQ-ACK codebook generated based all the DL slots of the set of DL slots and the set of SLIVs for the DL slots. These embodiments are described in more detail below.

th Some embodiments are directed to a gNodeB (gNB) configured for operation in a 5generation (5G) new radio (NR) system (5GS) (5G NR). In these embodiments, the gNB may encode a downlink control information (DCI) format for transmission to a user equipment (UE). For operations at subcarrier spacings (SCS) of 120 kHz, 480 kHz and 960 kHz, the DCI format may be encoded as a multi-transmission time interval (TTI) DCI scheduling multiple physical downlink shared channels (PDSCHs). In these embodiments, the gNB may encode multiple scheduled PDSCHs for transmission to the UE in accordance with the DCI format. The gNB may also decode a HARQ-ACK in an uplink slot from the UE. The HARQ-ACK may comprise a Type-1 HARQ-ACK codebook generated by the UE based on downlink (DL) slots of a set of DL slots for the multiple scheduled PDSCHs and a set of Start and Length Indicator Values (SLIVs) for each of the DL slots. In these embodiments, the set of DL slots and the SLIVs for the DL slots may be based on configured slot timing values (K1) and a configured time domain resource allocation (TDRA) table. In these embodiments, candidate PDSCH reception occasions correspond to the uplink slot correspond to positions in the HARQ-ACK codebook. These embodiments are described in more detail below.

1 FIG.A 140 101 102 101 102 101 102 101 101 illustrates an architecture of a network in accordance with some embodiments. The networkA is shown to include user equipment (UE)and UE. The UEsandare illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks) but may also include any mobile or non-mobile computing device, such as Personal Data Assistants (PDAs), pagers, laptop computers, desktop computers, wireless handsets, drones, or any other computing device including a wired and/or wireless communications interface. The UEsandcan be collectively referred to herein as UE, and UEcan be used to perform one or more of the techniques disclosed herein.

140 Any of the radio links described herein (e.g., as used in the networkA or any other illustrated network) may operate according to any exemplary radio communication technology and/or standard.

LTE and LTE-Advanced are standards for wireless communications of high-speed data for UE such as mobile telephones. In LTE-Advanced and various wireless systems, carrier aggregation is a technology according to which multiple carrier signals operating on different frequencies may be used to carry communications for a single UE, thus increasing the bandwidth available to a single device. In some embodiments, carrier aggregation may be used where one or more component carriers operate on unlicensed frequencies.

Embodiments described herein can be used in the context of any spectrum management scheme including, for example, dedicated licensed spectrum, unlicensed spectrum, (licensed) shared spectrum (such as Licensed Shared Access (LSA) in 2.3-2.4 GHz, 3.4-3.6 GHz, 3.6-3.8 GHz, and further frequencies and Spectrum Access System (SAS) in 3.55-3.7 GHz and further frequencies).

Embodiments described herein can also be applied to different Single Carrier or OFDM flavors (CP-OFDM, SC-FDMA, SC-OFDM, filter bank-based multicarrier (FBMC), OFDMA, etc.) and in particular 3GPP NR (New Radio) by allocating the OFDM carrier data bit vectors to the corresponding symbol resources.

101 102 101 102 In some embodiments, any of the UEsandcan comprise an Internet-of-Things (IoT) UE or a Cellular IoT (CIoT) UE, which can comprise a network access layer designed for low-power IoT applications utilizing short-lived UE connections. In some embodiments, any of the UEsandcan include a narrowband (NB) IoT UE (e.g., such as an enhanced NB-IoT (eNB-IoT) UE and Further Enhanced (FeNB-IoT) UE). An IoT UE can utilize technologies such as machine-to-machine (M2M) or machine-type communications (MTC) for exchanging data with an MTC server or device via a public land mobile network (PLMN), Proximity-Based Service (ProSe) or device-to-device (D2D) communication, sensor networks, or IoT networks. The M2M or MTC exchange of data may be a machine-initiated exchange of data. An IoT network includes interconnecting IoT UEs, which may include uniquely identifiable embedded computing devices (within the Internet infrastructure), with short-lived connections. The IoT UEs may execute background applications (e.g., keep-alive messages, status updates, etc.) to facilitate the connections of the IoT network.

101 102 In some embodiments, any of the UEsandcan include enhanced MTC (eMTC) UEs or further enhanced MTC (FeMTC) UEs.

101 102 110 110 101 102 103 104 103 104 The UEsandmay be configured to connect, e.g., communicatively couple, with a radio access network (RAN). The RANmay be, for example, an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), a NextGen RAN (NG RAN), or some other type of RAN. The UEsandutilize connectionsand, respectively, each of which comprises a physical communications interface or layer (discussed in further detail below); in this example, the connectionsandare illustrated as an air interface to enable communicative coupling and can be consistent with cellular communications protocols, such as a Global System for Mobile Communications (GSM) protocol, a code-division multiple access (CDMA) network protocol, a Push-to-Talk (PTT) protocol, a PTT over Cellular (POC) protocol, a Universal Mobile Telecommunications System (UMTS) protocol, a 3GPP Long Term Evolution (LTE) protocol, a fifth-generation (5G) protocol, a New Radio (NR) protocol, and the like.

101 102 105 105 In an aspect, the UEsandmay further directly exchange communication data via a ProSe interface. The ProSe interfacemay alternatively be referred to as a sidelink interface comprising one or more logical channels, including but not limited to a Physical Sidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel (PSSCH), a Physical Sidelink Discovery Channel (PSDCH), and a Physical Sidelink Broadcast Channel (PSBCH).

102 106 107 107 106 106 The UEis shown to be configured to access an access point (AP)via connection. The connectioncan comprise a local wireless connection, such as, for example, a connection consistent with any IEEE 802.11 protocol, according to which the APcan comprise a wireless fidelity (WiFi) router. In this example, the APis shown to be connected to the Internet without connecting to the core network of the wireless system (described in further detail below).

110 103 104 111 112 111 112 110 111 112 The RANcan include one or more access nodes that enable the connectionsand. These access nodes (ANs) can be referred to as base stations (BSs), NodeBs, evolved NodeBs (eNBs), Next Generation NodeBs (gNBs), RAN nodes, and the like, and can comprise ground stations (e.g., terrestrial access points) or satellite stations providing coverage within a geographic area (e.g., a cell). In some embodiments, the communication nodesandcan be transmission/reception points (TRPs). In instances when the communication nodesandare NodeBs (e.g., eNBs or gNBs), one or more TRPs can function within the communication cell of the NodeBs. The RANmay include one or more RAN nodes for providing macrocells, e.g., macro-RAN node, and one or more RAN nodes for providing femtocells or picocells (e.g., cells having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells), e.g., low power (LP) RAN node.

111 112 101 102 111 112 110 111 112 Any of the RAN nodesandcan terminate the air interface protocol and can be the first point of contact for the UEsand. In some embodiments, any of the RAN nodesandcan fulfill various logical functions for the RANincluding, but not limited to, radio network controller (RNC) functions such as radio bearer management, uplink and downlink dynamic radio resource management and data packet scheduling, and mobility management. In an example, any of the nodesand/orcan be a new generation Node-B (gNB), an evolved node-B (eNB), or another type of RAN node.

110 120 113 120 113 114 11 112 122 115 111 112 121 1 1 FIGS.B-C l The RANis shown to be communicatively coupled to a core network (CN)via an S1 interface. In embodiments, the CNmay be an evolved packet core (EPC) network, a NextGen Packet Core (NPC) network, or some other type of CN (e.g., as illustrated in reference to). In this aspect, the S1 interfaceis split into two parts: the S1-U interface, which carries traffic data between the RAN nodesandand the serving gateway (S-GW), and the S1-mobility management entity (MME) interface, which is a signaling interface between the RAN nodesandand MMEs.

120 121 122 123 124 121 121 124 120 124 124 In this aspect, the CNcomprises the MMEs, the S-GW, the Packet Data Network (PDN) Gateway (P-GW), and a home subscriber server (HSS). The MMEsmay be similar in function to the control plane of legacy Serving General Packet Radio Service (GPRS) Support Nodes (SGSN). The MMEsmay manage mobility embodiments in access such as gateway selection and tracking area list management. The HSSmay comprise a database for network users, including subscription-related information to support the network entities' handling of communication sessions. The CNmay comprise one or several HSSs, depending on the number of mobile subscribers, on the capacity of the equipment, on the organization of the network, etc. For example, the HSScan provide support for routing/roaming, authentication, authorization, naming/addressing resolution, location dependencies, etc.

122 113 110 110 120 122 122 The S-GWmay terminate the S1 interfacetowards the RAN, and routes data packets between the RANand the CN. In addition, the S-GWmay be a local mobility anchor point for inter-RAN node handovers and also may provide an anchor for inter-3GPP mobility. Other responsibilities of the S-GWmay include a lawful intercept, charging, and some policy enforcement.

123 123 120 184 125 123 131 184 123 184 125 184 101 102 120 The P-GWmay terminate an SGi interface toward a PDN. The P-GWmay route data packets between the EPC networkand external networks such as a network including the application server(alternatively referred to as application function (AF)) via an Internet Protocol (IP) interface. The P-GWcan also communicate data to other external networksA, which can include the Internet, IP multimedia subsystem (IPS) network, and other networks. Generally, the application servermay be an element offering applications that use IP bearer resources with the core network (e.g., UMTS Packet Services (PS) domain, LTE PS data services, etc.). In this aspect, the P-GWis shown to be communicatively coupled to an application servervia an IP interface. The application servercan also be configured to support one or more communication services (e.g., Voice-over-Internet Protocol (VoIP) sessions, PTT sessions, group communication sessions, social networking services, etc.) for the UEsandvia the CN.

123 126 120 126 184 123 The P-GWmay further be a node for policy enforcement and charging data collection. Policy and Charging Rules Function (PCRF)is the policy and charging control element of the CN. In a non-roaming scenario, in some embodiments, there may be a single PCRF in the Home Public Land Mobile Network (HPLMN) associated with a UE's Internet Protocol Connectivity Access Network (IP-CAN) session. In a roaming scenario with a local breakout of traffic, there may be two PCRFs associated with a UE's IP-CAN session: a Home PCRF (H-PCRF) within an HPLMN and a Visited PCRF (V-PCRF) within a Visited Public Land Mobile Network (VPLMN). The PCRFmay be communicatively coupled to the application servervia the P-GW.

140 In some embodiments, the communication networkA can be an IoT network or a 5G network, including 5G new radio network using communications in the licensed (5G NR) and the unlicensed (5G NR-U) spectrum. One of the current enablers of IoT is the narrowband-IoT (NB-IoT).

110 120 110 120 An NG system architecture can include the RANand a 5G network core (5GC). The NG-RANcan include a plurality of nodes, such as gNBs and NG-eNBs. The core network(e.g., a 5G core network or 5GC) can include an access and mobility function (AMF) and/or a user plane function (UPF). The AMF and the UPF can be communicatively coupled to the gNBs and the NG-eNBs via NG interfaces. More specifically, in some embodiments, the gNBs and the NG-eNBs can be connected to the AMF by NG-C interfaces, and to the UPF by NG-U interfaces. The gNBs and the NG-eNBs can be coupled to each other via Xn interfaces.

In some embodiments, the NG system architecture can use reference points between various nodes as provided by 3GPP Technical Specification (TS) 23.501 (e.g., V15.4.0, 2018 December). In some embodiments, each of the gNBs and the NG-eNBs can be implemented as a base station, a mobile edge server, a small cell, a home eNB, and so forth. In some embodiments, a gNB can be a master node (MN) and NG-eNB can be a secondary node (SN) in a 5G architecture.

1 FIG.B 1 FIG.B 140 102 110 140 132 136 148 150 134 142 144 146 134 152 132 136 134 148 illustrates a non-roaming 5G system architecture in accordance with some embodiments. Referring to, there is illustrated a 5G system architectureB in a reference point representation. More specifically, UEcan be in communication with RANas well as one or more other 5G core (5GC) network entities. The 5G system architectureB includes a plurality of network functions (NFs), such as access and mobility management function (AMF), session management function (SMF), policy control function (PCF), application function (AF), user plane function (UPF), network slice selection function (NSSF), authentication server function (AUSF), and unified data management (UDM)/home subscriber server (HSS). The UPFcan provide a connection to a data network (DN), which can include, for example, operator services, Internet access, or third-party services. The AMFcan be used to manage access control and mobility and can also include network slice selection functionality. The SMFcan be configured to set up and manage various sessions according to network policy. The UPFcan be deployed in one or more configurations according to the desired service type. The PCFcan be configured to provide a policy framework using network slicing, mobility management, and roaming (similar to PCRF in a 4G communication system). The UDM can be configured to store subscriber profiles and data (similar to an HSS in a 4G communication system).

140 168 168 162 164 166 162 102 168 164 166 166 170 1 FIG.B In some embodiments, the 5G system architectureB includes an IP multimedia subsystem (IMS)B as well as a plurality of IP multimedia core network subsystem entities, such as call session control functions (CSCFs). More specifically, the IMSB includes a CSCF, which can act as a proxy CSCF (P-CSCF)BE, a serving CSCF (S-CSCF)B, an emergency CSCF (E-CSCF) (not illustrated in), or interrogating CSCF (I-CSCF)B. The P-CSCFB can be configured to be the first contact point for the UEwithin the IM subsystem (IMS)B. The S-CSCFB can be configured to handle the session states in the network, and the E-CSCF can be configured to handle certain embodiments of emergency sessions such as routing an emergency request to the correct emergency center or PSAP. The I-CSCFB can be configured to function as the contact point within an operator's network for all IMS connections destined to a subscriber of that network operator, or a roaming subscriber currently located within that network operator's service area. In some embodiments, the I-CSCFB can be connected to another IP multimedia networkE, e.g. an IMS operated by a different network operator.

146 160 160 168 164 166 In some embodiments, the UDM/HSScan be coupled to an application serverE, which can include a telephony application server (TAS) or another application server (AS). The ASB can be coupled to the IMSB via the S-CSCFB or the I-CSCFB.

1 FIG.B 1 FIG.B 102 132 110 132 110 134 136 134 148 150 134 152 136 148 146 132 134 146 136 132 136 144 132 144 146 132 148 132 148 132 132 142 A reference point representation shows that interaction can exist between corresponding NF services. For example,illustrates the following reference points: N1 (between the UEand the AMF), N2 (between the RANand the AMF), N3 (between the RANand the UPF), N4 (between the SMFand the UPF), N5 (between the PCFand the AF, not shown), N6 (between the UPFand the DN), N7 (between the SMFand the PCF, not shown), N8 (between the UDMand the AMF, not shown), N9 (between two UPFs, not shown), N10 (between the UDMand the SMF, not shown), N11 (between the AMFand the SMF, not shown), N12 (between the AUSFand the AMF, not shown), N13 (between the AUSFand the UDM, not shown), N14 (between two AMFs, not shown), N15 (between the PCFand the AMFin case of a non-roaming scenario, or between the PCFand a visited network and AMFin case of a roaming scenario, not shown), N16 (between two SMFs, not shown), and N22 (between AMFand NSSF, not shown). Other reference point representations not shown incan also be used.

1 FIG.C 1 FIG.B 140 140 154 156 illustrates a 5G system architectureC and a service-based representation. In addition to the network entities illustrated in, system architectureC can also include a network exposure function (NEF)and a network repository function (NRF). In some embodiments, 5G system architectures can be service-based and interaction between network functions can be represented by corresponding point-to-point reference points Ni or as service-based interfaces.

1 FIG.C 1 FIG.C 140 158 132 1581 136 158 154 158 148 158 146 158 150 158 156 158 142 158 144 In some embodiments, as illustrated in, service-based representations can be used to represent network functions within the control plane that enable other authorized network functions to access their services. In this regard, 5G system architectureC can include the following service-based interfaces: NamfH (a service-based interface exhibited by the AMF), Nsmf(a service-based interface exhibited by the SMF), NnefB (a service-based interface exhibited by the NEF), NpcfD (a service-based interface exhibited by the PCF), a NudmE (a service-based interface exhibited by the UDM), NafF (a service-based interface exhibited by the AF), NnrfC (a service-based interface exhibited by the NRF), NnssfA (a service-based interface exhibited by the NSSF), NausfG (a service-based interface exhibited by the AUSF). Other service-based interfaces (e.g., Nudr, N5g-eir, and Nudsf) not shown incan also be used.

1 1 FIGS.A-C In some embodiments, any of the UEs or base stations described in connection withcan be configured to perform the functionalities described herein.

Mobile communication has evolved significantly from early voice systems to today's highly sophisticated integrated communication platform. The next generation wireless communication system, 5G, or new radio (NR) will provide access to information and sharing of data anywhere, anytime by various users and applications. NR is expected to be a unified network/system that targets to meet vastly different and sometimes conflicting performance dimensions and services. Such diverse multi-dimensional requirements are driven by different services and applications. In general, NR will evolve based on 3GPP LTE-Advanced with additional potential new Radio Access Technologies (RATs) to enrich people's lives with better, simple, and seamless wireless connectivity solutions. NR will enable everything connected by wireless and deliver fast, rich content and services.

Rel-15 NR systems are designed to operate on the licensed spectrum. The NR-unlicensed (NR-U), a short-hand notation of the NR-based access to unlicensed spectrum, is a technology that enables the operation of NR systems on the unlicensed spectrum.

2 FIG. 200 200 202 210 201 202 200 206 208 202 206 illustrates a functional block diagram of a wireless communication device, in accordance with some embodiments. Wireless communication devicemay be suitable for use as a UE or gNB configured for operation in a 5G NR network. The communication devicemay include communications circuitryand a transceiverfor transmitting and receiving signals to and from other communication devices using one or more antennas. The communications circuitrymay include circuitry that can operate the physical layer (PHY) communications and/or medium access control (MAC) communications for controlling access to the wireless medium, and/or any other communications layers for transmitting and receiving signals. The communication devicemay also include processing circuitryand memoryarranged to perform the operations described herein. In some embodiments, the communications circuitryand the processing circuitrymay be configured to perform operations detailed in the above figures, diagrams, and flows.

202 202 202 206 200 201 202 208 206 208 208 In accordance with some embodiments, the communications circuitrymay be arranged to contend for a wireless medium and configure frames or packets for communicating over the wireless medium. The communications circuitrymay be arranged to transmit and receive signals. The communications circuitrymay also include circuitry for modulation/demodulation, upconversion/downconversion, filtering, amplification, etc. In some embodiments, the processing circuitryof the communication devicemay include one or more processors. In other embodiments, two or more antennasmay be coupled to the communications circuitryarranged for sending and receiving signals. The memorymay store information for configuring the processing circuitryto perform operations for configuring and transmitting message frames and performing the various operations described herein. The memorymay include any type of memory, including non-transitory memory, for storing information in a form readable by a machine (e.g., a computer). For example, the memorymay include a computer-readable storage device, read-only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash-memory devices and other storage devices and media.

200 In some embodiments, the communication devicemay be part of a portable wireless communication device, such as a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a smartphone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), a wearable computer device, or another device that may receive and/or transmit information wirelessly.

200 201 201 In some embodiments, the communication devicemay include one or more antennas. The antennasmay include one or more directional or omnidirectional antennas, including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas, or other types of antennas suitable for transmission of RF signals. In some embodiments, instead of two or more antennas, a single antenna with multiple apertures may be used. In these embodiments, each aperture may be considered a separate antenna. In some multiple-input multiple-output (MIMO) embodiments, the antennas may be effectively separated for spatial diversity and the different channel characteristics that may result between each of the antennas and the antennas of a transmitting device.

200 In some embodiments, the communication devicemay include one or more of a keyboard, a display, a non-volatile memory port, multiple antennas, a graphics processor, an application processor, speakers, and other mobile device elements. The display may be an LCD screen including a touch screen.

200 200 Although the communication deviceis illustrated as having several separate functional elements, two or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements including digital signal processors (DSPs), and/or other hardware elements. For example, some elements may include one or more microprocessors, DSPs, field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), radio-frequency integrated circuits (RFICs) and combinations of various hardware and logic circuitry for performing at least the functions described herein. In some embodiments, the functional elements of the communication devicemay refer to one or more processes operating on one or more processing elements.

In NR, HARQ based PDSCH transmission is adopted. gNB schedules a PDSCH transmission by transmitting a DCI. The PDSCH transmission carries only one TB if number of MIMO layers is no more than 4. Otherwise, two TBs are transmitted. UE detects the DCI, decode the PDSCH and then report a HARQ-ACK information to gNB. Consequently, gNB may schedule a new TB or a retransmission of the previous TB depending on the HARQ-ACK information from UE.

3 FIG. For a system operating above 52.6 GHz carrier frequency, the subcarrier spacing, is increased and the slot duration is reduced. A DCI may schedule PDSCH transmissions with one or multiple transport blocks (TBs).illustrates one example of multi-PDSCH scheduling. In the example, 4 PDSCHs (PDSCH #0-3) with different transport blocks (TB) are scheduled by a single DCI.

Various embodiments herein provide techniques for HARQ-ACK transmission assuming multiple PDSCHs can be scheduled by a DCI. For example, embodiments include techniques for HARQ-ACK transmission when semi-static HARQ-ACK codebook is configured for multi-PDSCH scheduling in system operating above 52.6 GHz carrier frequency.

A DCI may be able to schedule one or more PDSCHs with separate TBs. The number of scheduled PDSCHs by the DCI may be explicitly indicated by a field in the DCI. Alternatively, the number of scheduled PDSCHs by the DCI is jointly coded with other information field(s). For example, the number of scheduled PDSCHs for a row in a time domain resource allocation (TDRA) table equals to the number of configured SLIVs of the row. The maximum number of PDSCHs scheduled by a multi-TTI DCI is the maximum number of scheduled PDSCHs among all rows. For a row of TDRA table, each SLIV can be configured in a different slot. Alternatively, one or more SLIVs may be configured in the same slot.

Type1 HARQ-ACK codebook in NR is generated based on the configured set of slot timing values K1, the configured TDD UL-DL configurations (e.g. TDD-UL-DL-configurationCommon and TDD-UL-DL-configurationDedicated) and the time domain resource allocation (e.g. SLIV) table(s). In Type1 HARQ-ACK codebook, a set of occasions for candidate PDSCH reception are determined. Depending on UE capability, the number of occasions for a slot associated with a value n−K1 is either up to 1 or determined by non-overlapped SLIVs in the slot.

Type1 HARQ-ACK codebook could be extended to support HARQ-ACK feedback for the multiple PDSCHs scheduled by a multi-PDSCH DCI. The PDSCHs indicated by the SLIVs of a row in the TDRA table may be respectively allocated with different occasions of candidate PDSCH receptions in Type1 HARQ-ACK codebook.

Occasions Separately Determined for Each Slot for PDSCH Transmissions

1,k U 1,k U 1,k μ DL -μ DL μ DL -μ DL Corresponding to a value Kin the set of K1, one or more ending DL slots for the PDSCH transmissions can be determined. For the HARQ-ACK transmission in UL slot nand value K, PDSCH transmission(s) can be ended in DL slots ┌(n−K)·2┐+j, j=0, 1, . . . , ┌2┘−1. Then, the set of the DL slots that can be used for PDSCH transmissions can be determined by all the determined ending DL slots corresponding to all the values in the set of K1. The occasions for candidate PDSCH receptions can be allocated for each determined DL slot respectively.

1,k 1,k 1,k 1,k 1,k 1,k 1,k 1,k 1,k 1,k 1,k For example, if the SCS for PUCCH transmission and the PDSCH transmission is the same, for HARQ-ACK transmission in slot n, for each value Kin the set of K1, assuming maximum M PDSCHs can be scheduled by a DCI indicating the value K, the M PDSCHs are transmitted in DL slot n−K−M+1, n−K−M+2, . . . , n−K. The set of DL slots for PDSCH transmissions can be generated by including the DL slots determine by each value Kin the set of K1. Equivalently, the value Kcan be considered to be extended to M values, e.g. K+M−1, K+M−2, . . . , K. The extended set of K1 is generated by including the extensions of each value Kin the set of K1.

In one embodiment, a superset of SLIVs can be obtained by including all individual SLIVs of all rows in the TDRA table, then occasions of candidate PDSCH receptions in Type1 HARQ-ACK codebook can be generated by the set of DL slots that are determined by the set of K1, the superset of SLIVs and semi-static TDD UL-DL configuration. The procedure for Type1 HARQ-ACK codebook generation in NR can be reused to generate occasions for each determined DL slot assuming the superset of SLIVs.

4 FIG. 4 FIG. illustrates one example of the configuration of set of K1 and set of rows in TDRA table. It assumes that the SCS for PUCCH transmission and the PDSCH transmission is the same. In this example, the set of K1 have 3 values 2, 3 and 5. It is assumed the maximum number of PDSCHs scheduled by a DCI is 5. The TDRA table include 2 rows. The first row has 5 SLIVs which are allocated in 4 consecutive slots, e.g. SLIV {0-0, 0-1, 0-2, 0-3, 0-4}. the second row has 2 SLIVs in two consecutive slots, e.g. SLIV {1-0, 1-1}. In, for K1=2, 3, 5, it respectively determines DL slots for PDSCH transmissions {2, 3, 4, 5}, {3, 4, 5, 6} and {5, 6, 7, 8}. Finally, the set of determined DL slots include 7 values, e.g. {2, 3, 4, 5, 6, 7, 8}. Corresponding to HARQ-ACK transmission in slot n, all the possible PDSCH transmissions are in slot n-8 to slot n-2.

4 FIG. 4 FIG. In, the superset of SLIVs includes all individual SLIVs of all rows, e.g. 7 SLIVs {0-0, 0-1, 0-2, 0-3, 0-4, 1-0, 1-1}. Type1 HARQ-ACK codebook is generated assuming all determined DL slots and the superset of SLIVs of 7 SLIVs and semi-static TDD UL-DL configuration. In, 2 occasions are allocated for each of the 7 determined DL slots.

In one embodiment, a set of SLIVs can be determined for each DL slot that is determined by the set of K1, then occasions of candidate PDSCH receptions in Type1 HARQ-ACK codebook can be generated by the set of determined DL slots, the corresponding set of SLIVs for each determined DL slot and semi-static TDD UL-DL configuration. The existing procedure for Type1 HARQ-ACK codebook generation in NR can be reused to generate occasions for each DL slot assuming the corresponding set of SLIVs of the DL slot.

1,k 1,i 1,i For HARQ-ACK transmission in slot n, for a value K, the corresponding set of SLIVs for a determined DL slot only include a SLIV of a row, if the SLIV can be scheduled by a DCI with a value Kin the set of K1 so that the PDSCH of the SLIV is mapped to the determined DL slot, i may be same or different to k. Alternatively, the corresponding set of SLIVs for a determined DL slot only include a SLIV of a row, if the SLIV can be scheduled by a DCI with a value Kin the set of K1 so that the PDSCH of the SLIV can be transmitted in the determined DL slot taking into account the semi-static TDD UL-DL configuration, i may be same or different to k.

4 FIG. 5 FIG. SLIV {0-0} for DL slot n-8 SLIV {0-1} for DL slot n-7 SLIV {0-0, 0-2, 0-3, 1-0} for DL slot n-6 SLIV {0-0, 0-1, 0-4, 1-1} for DL slot n-5 SLIV {0-1, 0-2, 0-3, 1-0} for DL slot n-4 SLIV {0-2, 0-3, 0-4, 1-0, 1-1} for DL slot n-3 SLIV {0-4, 1-1} for DL slot n-2 The same assumption ason set of K1 and TDRA table are used in. The corresponding set of SLIVs for each DL slot that is determined by the set of K1 are:

5 FIG. Finally, Type1 HARQ-ACK codebook is generated for each determined DL slot using the corresponding set of SLIVs for the DL slot and semi-static TDD UL-DL configuration. In, the number of occasions for each determined DL slots are {1, 1, 2, 2, 2, 2, 2} respectively.

k,j 1,k k,j k,j 1,k U 1,k U k,j k,j μ DL -μ DL In one embodiment, a set of pairs (d,r) can be determined for each DL slot that is determined by a value Kin the set of K1, then occasions of candidate PDSCH receptions in Type1 HARQ-ACK codebook can be generated by the set of determined DL slots, the corresponding set of pairs (d,r) for each determined DL slot and semi-static TDD UL-DL configuration. A pair (d,r) indicates the PDSCH transmissions that can be scheduled by a DCI indicating a valid row r in TDRA table and value Kand ends in DL slot └n−K)·2┘+j. For HARQ-ACK transmission in slot n, the corresponding set of pairs for a determined DL slot only include a pair (d,r) only include a row r, if at least one of the PDSCH transmissions that are associated with the pair (d,r) is mapped to the determined DL slot, considering the semi-static TDD UL-DL configuration.

k,j In one option, for a determined DL slot, the set of pairs (d,r) are divided into one or multiple groups. A pair only belongs to a group. For any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. For the determined DL slot, the occasion(s) are allocated for each group of pairs respectively. For a group, the number of allocated occasions equals to the maximum number of SLIV(s) that is available for PDSCH transmission in the determined DL slot among all the pairs in the group.

4 FIG. 6 FIG. k,j 2,0 Row 0 corresponding to K1=2, e.g. pair (d, 0) 1,0 Row 0 corresponding to K1=3, e.g. pair (d, 0) 0,0 Row 0 corresponding to K1=5, e.g. pair (d, 0) 0,0 Row 1 corresponding to K1=5, e.g. pair (d, 1) The same assumption ason set of K1 and TDRA table are used in. For example, there are 4 pairs (d,r) for determined DL slot n-5, e.g.

5 FIG. 6 FIG. k,j If only the SLIVs which maps to DL slot n-5 is considered as shown in, there are two non-overlap SLIVs, e.g. SLIV 1-4 and SLIV 2-1, hence two occasions are necessary for slot n-5. However, by checking the overlap of the 4 pairs (d,r), only one occasion is needed for slot n-5, since any two of the four pairs are overlapped. In, the number of occasions for each determined DL slots are {1, 1, 2, 1, 2, 2, 2} respectively.

k k,j G is a group of pairs (d,r) for a determined DL slot, where, for any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. For example, a pair with smallest last OFDM symbol index in the determined DL slot among all remaining pairs is determined and is used to generate a group of G. j Ois to determine the number of occasions that need to be allocated for the determined DL slot for the group of G The determined DL slots by the set of K1 are ordered in ascending order, e.g. D, k=0, 1, . . . . For example, referring to the pseudo code in section 9.1.2.1 in TS 38.213,

Set j = 0 - index of occasion for candidate PDSCH reception or SPS PDSCH release Set B = ∅ A,c Set M= ∅ Set C(D) to the cardinality of set D Set k = 0 - index of determined DL slot in ascending order in set D while k < C(D) Set R to the set of pairs for determined DL slot k Set C(R) to the cardinality of R Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R while R ≠ ∅ Set r = 0 j Set O= 1 Set G = m - a group of pairs including pair m, any two pairs in the group are overlapped while r < C(R) if pair r is overlapped with all pairs of G r,k b= j; - lowest index of occasion for candidate PDSCH reception or SPS PDSCH release associated with SLIV(s) of pair r in the determined DL slot k j j O= max(A,O), A is the number of SLIV(s) that are available for PDSCH transmission of pair r in the determined DL slot k R = R\r; G = G ∪ r; - add an element of pair r to the group of G r,k B = B ∪ b; else r = r + 1; end if end while A,c A,c j M= M∪ (j, j + 1, . . . , j + O− 1); j j = j + O; Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R; end while k = k + 1; end while

k,j In another option, for a determined DL slot, the set of pairs (d,r) are divided into one or multiple groups. If a pair contains N SLIVs that are available for PDSCH transmissions in the determined DL slot, the pair is treated as N pairs which respectively contain the N SLIVs in the determined DL slot, N≥1. The SLIVs in slots other than the determined DL slot for the pair commonly apply to the N pairs. Consequently, the pair belongs to N groups. For any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. For the determined DL slot, one occasion is allocated for each group of pairs respectively. For the pair containing N SLIVs in the determined DL slot, the N occasions determined for the N groups are respectively used to carry HARQ-ACK of the N SLIVs.

7 FIG. k,j 7 FIG. For example, there are 4 pairs (d,r) for determined DL slot n-3 in, e.g. 1,0 Row 0 corresponding to K1=2, e.g. pair (d, 0) 1,0 Row 1 corresponding to K1=2, e.g. pair (d, 1) 0,0 Row 1 corresponding to K1=3, e.g. pair (d, 0) 0,0 Row 1 corresponding to K1=3, e.g. pair (d, 1) illustrates one example of the configuration of set of K1 and set of rows in TDRA table. It assumes that the SCS for PUCCH transmission and the PDSCH transmission is the same. In this example, the set of K1 have 2 values 2 and 3. It is assumed the maximum number of PDSCHs scheduled by a DCI is 3. The TDRA table include 2 rows. The first row has 3 SLIVs which are allocated in 2 consecutive slots, e.g. SLIV {0-0, 0-1, 0-2}. the second row has 2 SLIVs in two consecutive slots, e.g. SLIV {1-0, 1-1}. Corresponding to HARQ-ACK transmission in slot n, the ending DL slots that are determined by the set of K1 are slot n-3 and n-2. All the possible PDSCH transmissions are in slot n-4 to slot n-2.

1,0 1,0 1,0 1,0 1,0 0,0 1,0 1,0 0,0 1,0 1,0 7 FIG. Since the pair (d, 0) has two SLIVs in slot n-3, pair (d, 0) is treated as two pairs, e.g. (d, 0) with SLIV 0-0 in slot n-3 and (d, 0) with SLIV 0-1 in slot n-3. Therefore, there are effectively 5 pairs which are divided into 3 groups. The first group includes pair (d, 0) with SLIV 0-0 in slot n-3 and (d, 0). The second group includes pair (d, 0) with SLIV 0-1 in slot n-3 and (d, 0). The third group includes pair (d, 0). Three occasions are allocated to the three groups respectively. the SLIV 0-0 of pair (d, 0) is associated with the occasion for the first group, while the SLIV 0-1 of pair (d, 0) is associated with the occasion for the second group. In, the number of occasions for each determined DL slots are {1, 3, 1} respectively.

k k,j G is a group of pairs (d,r) for a determined DL slot, where, for any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. For example, a pair with smallest last OFDM symbol index in the determined DL slot among all remaining pairs is determined and is used to generate a group of G. The determined DL slots by the set of K1 are ordered in ascending order, e.g. D, k=0, 1, . . . . For example, referring to the pseudo code in section 9.1.2.1 in TS 38.213,

Set j = 0 - index of occasion for candidate PDSCH reception or SPS PDSCH release Set B = ∅ A,c Set M= ∅ Set C(D) to the cardinality of set D Set k = 0 - index of determined DL slot in ascending order in set D while k < C(D) for a pair contains N SLIVs that are available for PDSCH transmissions in the determined DL slot, the pair is treated as N pairs which respectively contain the N SLIVs in the determined DL slot, N ≥ 1. The SLIVs in slots other than the determined DL slot for the pair commonly apply to the N pairs. Set R to the set of pairs for determined DL slot k Set C(R) to the cardinality of R Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R while R ≠ ∅ Set r = 0 Set G = m - a group of pairs including pair m, any two pairs in the group are overlapped while r < C(R) f pair r is overlapped with all pairs of G r,k b= j; - index of occasion for candidate PDSCH reception or SPS PDSCH release associated with the SLIV of pair r in the determined DL slot k R = R\r; G = G ∪ r; - add an element of pair r to the group of G r,k B = B ∪ b; else r = r + 1; end if end while A,c A,c M= M∪ j; Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R; end while k = k + 1; end while

k,j In another option, for a determined DL slot, the set of pairs (d,r) are divided into one or multiple groups. If a pair contains N SLIVs that are available for PDSCH transmissions in the determined DL slot, the pair is grouped into N groups which are respectively used to allocate the occasions for the N SLIVs, N≥1. The largest OFDM symbol index of the N SLIVs in the determined DL slot could be always referred in the allocation of occasion(s). For any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. To check the overlap between the pair with N SLIVs and another pair, all the N SLIVs can be considered. For the determined DL slot, one occasion is allocated for each group of pairs respectively. For the pair containing N SLIVs in the determined DL slot, the N occasions determined for the N groups are respectively used to carry HARQ-ACK of the N SLIVs.

7 FIG. 8 FIG. 8 FIG. 1,0 1,0 0,0 1,0 0,0 1,0 1,0 1,0 1,0 1,0 1,0 The same assumption ason set of K1 and TDRA table are used in. The 4 pairs are divided into 2 groups, e.g. group 1 and group 2. Group 1 includes pair (d, 0), (d, 1), (d, 0). Group 2 includes pair (d, 0) and (d, 0). Since the pair (d, 0) has two SLIVs in slot n-3, pair (d, 0) belongs to the 2 groups. Group 1 is used to allocate occasion for the SLIV 0-0 in slot n-3 of pair (d, 0). Group 2 is used to allocate occasion for the SLIV 0-1 in slot n-3 of pair (d, 0). Two occasions are allocated to the Two groups respectively. the SLIV 0-0 of pair (d, 0) is associated with the occasion for the first group, while the SLIV 0-1 of pair (d, 0) is associated with the occasion for the second group. In, the number of occasions for each determined DL slots are {1, 2, 1} respectively.

k k,j G is a group of pairs (d,r) for a determined DL slot, where, for any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. For example, a pair with smallest last OFDM symbol index in the determined DL slot among all remaining pairs is determined and is used to generate a group of G. The determined DL slots by the set of K1 are ordered in ascending order, e.g. D, k=0, 1, . . . . For example, referring to the pseudo code in section 9.1.2.1 in TS 38.213,

Set j = 0 - index of occasion for candidate PDSCH reception or SPS PDSCH release Set B = ∅ A,c Set M= ∅ Set C(D) to the cardinality of set D Set k = 0 - index of determined DL slot in ascending order in set D while k < C(D) for a pair contains N SLIVs that are available for PDSCH transmissions in the determined DL slot, the pair is treated as N pairs which respectively contain the N SLIVs in the determined DL slot, N ≥ 1. The SLIVs in slots other than the determined DL slot for the pair commonly apply to the N pairs. Set R to the set of pairs for determined DL slot k Set C(R) to the cardinality of R Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R while R ≠ ∅ Set r = 0 Set G = m - a group of pairs including pair m, any two pairs in the group are overlapped while r < C (R) if pair r is overlapped with all pairs of G r,k b= j; - index of occasion for candidate PDSCH reception or SPS PDSCH release associated with the SLIV of pair r in the determined DL slot k R = R\r; G = G ∪ r; - add an element of pair r to the group of G r,k B = B ∪ b; else r = r + 1; end if end while A,c A,c M= M∪ j; Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R; end while k = k + 1; end while

k,j In another option, for a determined DL slot, the set of pairs (d,r) are divided into one or multiple groups. If a pair contains N SLIVs that are available for PDSCH transmissions in the determined DL slot, the pair is grouped into N groups which are respectively used to allocate the occasions for the N SLIVs, ((N≥1)). The largest OFDM symbol index of the N SLIVs in the determined DL slot could be always referred in the allocation of occasion(s). For any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. To check the overlap between the pair with N SLIVs and another pair, all the N SLIVs can be considered. For the determined DL slot, one occasion is allocated for each group of pairs respectively. For the pair containing N SLIVs in the determined DL slot, the N occasions determined for the N groups are respectively used to carry HARQ-ACK of the N SLIVs.

7 FIG. 8 FIG. 8 FIG. 1,0 1,0 0,0 1,0 0,0 1,0 1,0 1,0 1,0 1,0 1,0 The same assumption ason set of K1 and TDRA table are used in. The 4 pairs are divided into 2 groups, e.g. group 1 and group 2. Group 1 includes pair (d, 0), (d, 1), (d, 0). Group 2 includes pair (d, 0) and (d, 1). Since the pair (d, 0) has two SLIVs in slot n-3, pair (d, 0) belongs to the 2 groups. Group 1 is used to allocate occasion for the SLIV 0-0 in slot n-3 of pair (d, 0). Group 2 is used to allocate occasion for the SLIV 0-1 in slot n-3 of pair (d, 0). Two occasions are allocated to the Two groups respectively. the SLIV 0-0 of pair (d, 0) is associated with the occasion for the first group, while the SLIV 0-1 of pair (d, 0) is associated with the occasion for the second group. In, the number of occasions for each determined DL slots are {1, 2, 1} respectively.

k k,j G is a group of pairs (d,r) for a determined DL slot, where, for any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair. For example, a pair with smallest last OFDM symbol index in the determined DL slot among all remaining pairs is determined and is used to generate a group of G. The determined DL slots by the set of K1 are ordered in ascending order, e.g D, k=0, 1, . . . . For example, referring to the pseudo code in section 9.1.2.1 in TS 38.213,

Set j = 0 - index of occasion for candidate PDSCH reception or SPS PDSCH release Set B = ∅ A,c Set M= ∅ Set C(D) to the cardinality of set D Set k = 0 - index of determined DL slot in ascending order in set D while k < C(D) Set R to the set of pairs for determined DL slot k Set C(R) to the cardinality of R Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R while R ≠ ∅ Set r = 0 Set G = m - a group of pairs including pair m, any two pairs in the group are overlapped while r < C(R) if pair r is overlapped with all pairs of G r,k b= j; - index of occasion for candidate PDSCH reception or SPS PDSCH release associated with a SLIV without allocated occasion of pair r in the determined DL slot k  if all SLIV(s) of pair r have allocated occasions  R = R\r;  end if G = G ∪ r; - add an element of pair r to the group of G r,k B = B ∪ b; else r = r + 1; end if end while A,c A,c M= M∪ j; Set m to the index of a pair with smallest last OFDM symbol index in the determined DL slot k among all pairs of R; end while k = k + 1; end while Occasions Separately Determined for Each Ending Slot for PDSCH Transmissions

1,k U 1,k U 1,k μ DL -μ DL μ DL -μ DL Corresponding to a value Kin the set of K1, one or more ending DL slots for the PDSCH transmissions can be determined. For the HARQ-ACK transmission in UL slot nand value K, PDSCH transmission(s) can be ended in DL slots └n−K)·2┘+j, j=0, 1, . . . , ┌2┐−1. Then, the occasions for candidate PDSCH receptions can be allocated for each determined ending DL slot respectively.

1,k 1,k For each ending DL slot determined by a value Kin the set of K1, a row in TDRA table is considered as valid, if at least X SLIV(s) corresponding to the row are available for PDSCH transmission by applying the semi-static TDD UL-DL configuration, if the PDSCH transmission corresponding to the row is scheduled by a DCI indicating the value Kand ends in the determined ending slot. X could be a fixed value, e.g. 1, or X can be configured by high layer signaling.

1,k 1,k In one embodiment, the occasion(s) for candidate PDSCH receptions are separately allocated for each ending slot determined by a value Kin the set of K1, if at least one row in the TDRA table is valid for potential PDSCH transmission by applying the semi-static TDD UL-DL configuration. To allocate occasion(s) that are associated with a determined ending DL slot, the last SLIV of all valid rows of the determined ending DL slot are processed. For example, the procedure for Type1 HARQ-ACK codebook generation in NR can be reused to generate occasions for an ending slot determined by the value K.

9 FIG. illustrates one example of the configuration of set of K1 and set of rows in TDRA table. It assumes that the SCS for PUCCH transmission and the PDSCH transmission is the same. In this example, the set of K1 have 2 values 2 and 3. It is assumed the maximum number of PDSCHs scheduled by a DCI is 5. The TDRA table include 4 rows. The first row has 5 SLIVs which are allocated in 4 consecutive slots, e.g. SLIV {0-0, 0-1, 0-2, 0-3, 0-4}. The second row has 3 SLIVs in three consecutive slots, e.g. SLIV {1-0, 1-1, 1-2}. The third row has 2 SLIVs in two consecutive slots, e.g. SLIV {2-0, 2-1}. the fourth row has single SLIV, e.g. SLIV {3-0}. Corresponding to HARQ-ACK transmission in slot n, the ending DL slots that are determined by the set of K1 is slot n-3 and n-2.

1,k 1,k In one option, the number of HARQ-ACK bits for an occasion associated with an ending slot determined by the value Kis the maximum number of configured SLIVs among all rows times N. Alternatively, the number of HARQ-ACK bits for an occasion associated with an ending slot determined by value Kis the maximum number of configured SLIVs among all valid rows times N. N is the number of TBs per PDSCH if a code block group (CBG) based transmission is not used. Otherwise, N is the number of CBG per PDSCH.

9 FIG. In, 2 occasions of candidate PDSCH receptions are allocated for DL slot n-2. 5 HARQ-ACK bits are reported for each occasion since the maximum number of configured SLIVs among all rows is 5.

1,k In one option, the number of HARQ-ACK bits for an occasion associated with an ending slot determined by value Kis determined by the maximum number of SLIVs that are available for PDSCH transmission among all valid rows by applying the semi-static TDD UL-DL configuration. For a valid row r, denote the number of SLIV(s) that are available for PDSCH transmission by applying the semi-static TDD UL-DL configuration as

1,k The number of HARQ-ACK bits for an occasion associated with the ending slot determined by value Kis the maximum value

among all valid rows times N.

9 FIG. In, 2 occasions of candidate PDSCH receptions are allocated for DL slot n-2. 4 HARQ-ACK bits are reported for each occasion since maximum number of available SLIVs among all rows is 4 by excluding uplink slot n-4 which cannot be used for PDSCH transmission.

1,k In one option, the number of HARQ-ACK bits is separately determined for each occasion associated with an ending slot determined by value K. The number of HARQ-ACK bits for an occasion is the maximum number of configured SLIVs among all valid rows that are associated with the occasion times N.

9 FIG. In, 2 occasions of candidate PDSCH receptions are allocated for DL slot n-2. The first and third rows are associated with the first occasion. The second and fourth rows are associated with the second occasion. 5 HARQ-ACK bits are reported for the first occasion since maximum number of configured SLIVs of the first and third rows is 5. On the other hand, 3 HARQ-ACK bits are reported for the second occasion since maximum number of configured SLIVs of the second and fourth rows is 3.

1,k In one option, the number of HARQ-ACK bits is separately determined for each occasion associated with an ending slot determined by a value Kby applying the semi-static TDD UL-DL configuration. For a valid row r that is associated with an occasion for a determined ending slot, the number of SLIV(s) that are available for PDSCH transmission by applying the semi-static TDD UL-DL configuration is denoted as

The number of HARQ-ACK bits for the occasion is the maximum value

among all valid rows that are associated with the occasion times N.

9 FIG. In, 2 occasions of candidate PDSCH receptions are allocated for DL slot n-2. The first and third rows are associated with the first occasion. The second and fourth rows are associated with the second occasion. 4 HARQ-ACK bits are reported for the first occasion since maximum number of available SLIVs of the first and third rows is 4 by excluding uplink slot n-4 which cannot be used for PDSCH transmission. On the other hand, 2 HARQ-ACK bits are reported for the second occasion since maximum number of available SLIVs of the second and fourth rows is 2 by excluding uplink slot n-4 which cannot be used for PDSCH transmission.

1,k In one embodiment, for each ending DL slot determined by a value Kin the set of K1, the valid rows in TDRA table are divided into one or multiple groups. For any two valid rows in a group, at least one SLIV of a first row is overlapped with the SLIV(s) of a second row. For example, the valid rows can be grouped based on the last SLIV of the valid rows and by checking the overlap of the valid rows. One occasion of candidate PDSCH reception is allocated for each group of valid rows.

10 FIG. illustrates one example of the configuration of set of K1 and set of rows in TDRA table. It assumes that the SCS for PUCCH transmission and the PDSCH transmission is the same. In this example, the set of K1 have 2 values 2 and 3. It is assumed the maximum number of PDSCHs scheduled by a DCI is 5. The TDRA table include 4 rows. The first row has 5 SLIVs which are allocated in 4 consecutive slots, e.g. SLIV {0-0, 0-1, 0-2, 0-3, 0-4}. The second row has 3 SLIVs in three consecutive slots, e.g. SLIV {1-0, 1-1, 1-3}. The third row has 2 SLIVs in two consecutive slots, e.g. SLIV {2-0, 2-1}. the fourth row has single SLIV, e.g. SLIV {3-0}. Corresponding to HARQ-ACK transmission in slot n, the ending DL slots that are determined by the set of K1 is slot n-3 and n-2.

10 FIG. In, the same grouping applies to the two determined ending DL slots. The rows can be divided into two groups. The first group consists of row 0, row 1 and row 3. The second group consists of row 2. Therefore, two occasions of candidate PDSCH receptions are allocated for each determined ending DL slot.

1,k 1,k In one option, the number of HARQ-ACK bits for an occasion associated with an ending slot determined by a value Kis the maximum number of configured SLIVs among all rows times N. Alternatively, the number of HARQ-ACK bits for an occasion associated with an ending slot determined by a value Kis the maximum number of configured SLIVs among all valid rows times N. N is the number of TBs per PDSCH if CBG based transmission is not used. Otherwise, N is the number of CBG per PDSCH.

10 FIG. For example, in, for DL slot n-2, 5 HARQ-ACK bits can be reported for each occasion since the maximum number of configured SLIVs among all rows is 5.

1,k In one option, the number of HARQ-ACK bits for an occasion associated with an ending slot determined by a value Kis determined by the maximum number of SLIVs that are available for PDSCH transmission among all valid rows by applying the semi-static TDD UL-DL configuration. For a valid row r, denote the number of SLIV(s) that are available for PDSCH transmission by applying the semi-static TDD UL-DL configuration as

1,k The number of HARQ-ACK bits for an occasion associated with the ending slot determined with value Kis the maximum value

among all valid rows times N.

10 FIG. For example, in, for DL slot n-2, 4 HARQ-ACK bits are reported for each occasion since maximum number of available SLIVs among all valid rows is 4 by excluding uplink slot n-4 which cannot be used for PDSCH transmission.

1,k In one option, the number of HARQ-ACK bits is separately determined for each occasion associated with an ending slot determined by a value K. The number of HARQ-ACK bits for an occasion is the maximum number of SLIVs that are available for PDSCH transmission among all valid rows that are associated with the occasion times N.

10 FIG. For example, in, for DL slot n-2, 5 HARQ-ACK bits are reported for the first occasion since maximum number of configured SLIVs of the rows in the first group is 5. On the other hand, 3 HARQ-ACK bits are reported for the second occasion since maximum number of configured SLIVs of the row in the second group is 3.

1,k In one option, the number of HARQ-ACK bits is separately determined for each occasion associated with an ending slot determined by a value Kby applying the semi-static TDD UL-DL configuration. For a valid row r that is associated with an occasion for a determined ending DL slot, the number of SLIV(s) that are available for PDSCH transmission by applying the semi-static TDD UL-DL configuration is denoted a

The number of HARQ-ACK bits for the occasion is the maximum value

among all valid rows that are associated with the occasion times N.

10 FIG. For example, in, for DL slot n-2, 4 HARQ-ACK bits are reported for the first occasion since maximum number of available SLIVs of the rows in the first group is 4 by excluding uplink slot n-4 which cannot be used for PDSCH transmission. On the other hand, 2 HARQ-ACK bits are reported for the second occasion since maximum number of available SLIVs of the rows in the second group is 2 by excluding uplink slot n-4 which cannot be used for PDSCH transmission.

j Ois to determine the maximum number of SLIVs that is available for PDSCH transmission for an occasion j for candidate PDSCH reception. G is a group of valid rows for a determined ending DL slot, where, for any two valid rows in a group, at least one SLIV of a first row is overlapped with the SLIV(s) of a second row. The determined ending DL slots by the set of K1 are ordered in ascending order, e.g. Ek, k=0, 1, . . . . F For example, referring to the pseudo code in section 9.1.2.1 in TS 38.213,

Set j = 0 - index of occasion for candidate PDSCH reception or SPS PDSCH release Set B = ∅ A,c Set M= ∅ Set C(E) to the cardinality of set E Set k = 0 - index of determined ending DL slot in ascending order in set E While k < C(E) Set R to the set of valid rows for determined ending DL slot k Set C(R) to the cardinality of R Set m to the index of a row with smallest last OFDM symbol index in the determined ending DL slot k among all rows of R while R ≠ ∅ Set r = 0 j Set O= 1 Set G = m - the group of rows including row m, any two rows in the group are overlapped while r < C (R) if row r is overlapped with all rows of G r,k b= j; - index of occasion for candidate PDSCH reception or SPS PDSCH release associated with row r j j O= max(A,O), A is the number of SLIV(s) that are available for PDSCH transmission of row r; R = R\r; G = G ∪ r; - add an element of row r to the group of G r,k B = B ∪ b; else r = r + 1; end if end while A,c A,c M= M∪ j; j = j + 1; Set m to the index of a row with smallest last OFDM symbol index in the determined ending DL slot k among all rows or R; end while k = k + 1; end while Occasions Jointly Determined for all Ending Slots for PDSCH Transmissions

1,k U 1,k U 1,k 1,k 1,k μ DL -μ DL μ DL -μ DL Corresponding to a value Kin the set of K1, one or more ending DL slots for the PDSCH transmissions can be determined. For the HARQ-ACK transmission in UL slot nand value K, PDSCH transmission(s) can be ended in DL slots └n−K)·2┘+j, j=0, 1, . . . , ┌2┐−1. For each ending DL slot determined by a value Kin the set of K1, a row in TDRA table is considered as valid, if at least X SLIV(s) corresponding to the row are available for PDSCH transmission by applying the semi-static TDD UL-DL configuration, if the PDSCH transmission corresponding to the row is scheduled by a DCI indicating the value Kand ends in the determined ending slot. X could be a fixed value, e.g. 1, or X can be configured by high layer signaling.

k,j k,j 1,k U 1,k μ DL -μ DL In one embodiment, all pairs (d,r) including all valid rows corresponding to all the ending DL slots determined by all values in the set of K1 can be divided into the one or multiple groups, then occasions of candidate PDSCH receptions in Type1 HARQ-ACK codebook can be generated for the one or multiple groups. The occasions are allocated for each group separately and concatenated. A pair (d,r) indicates the PDSCH transmissions that can be scheduled by a DCI indicating a valid row r in TDRA table and value Kand end in DL slot └n−K)·2┘+j. For any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair, or if any SLIV of a first pair is not overlapped with any SLIV of a second pair, the two pairs are not mapped in the same slot.

The occasions for a group of pairs are allocated with the following rules:

k,j For a pair (d,r), denote the number of SLIV(s) that are available for PDSCH transmission by applying the semi-static TDD UL-DL configuration as

consecutive occasions are allocated for the row.

If two pairs in the group are not overlapped, separate occasions are allocated for the two pairs

2 If two pairs in the group are overlapped, the same occasions can be allocated to the two pairs if the rule) is not violated.

1,k For each k in descending order—k=K−1, K−2, . . . , 0 μ DL -μ UL For each j in ascending order—j=0, 1, . . . , ┌2┐−1 For each row r Set E=−1 Set E to the maximum number of The slot timing values in the set of K1 are ordered in descending order, e.g. K, k=K−1, K−2, . . . , 0. K is the number of configured slot timing values. For example, for a group of pairs,

k′,j′ k,j Set among all pairs (d,r′) which end in a DL slot that is earlier than the starting slot for pair (d,r)

k,j Set —the starting occasion index for the pair (d,r)

avail k,j k,j The number of occasions equals to the maximum number of Lis number of SLIVs that are available for PDSCH transmission for the pair (d,r)—the ending occasion index for the pair (d,r)

k,j among all pairs (d,r)

11 FIG. k,j 1,0 1,0 1,0 1,0 0,0 0,0 0,0 0,0 illustrates one example of the configuration of set of K1 and set of rows in TDRA table. In this example, the set of K1 have 2 values 2 and 3. It is assumed the maximum number of PDSCHs scheduled by a DCI is 4. The TDRA table include 4 rows. The first row has 4 SLIVs which are allocated in 4 consecutive slots, e.g. SLIV {0-0, 0-1, 0-2, 0-3}. The second row has 3 SLIVs in three consecutive slots, e.g. SLIV {1-0, 1-1, 1-2}. The third row has 2 SLIVs in two consecutive slots, e.g. SLIV {2-0, 2-1}. the fourth row has single SLIV, e.g. SLIV {3-0}. There are in total 8 pairs (d,r), e.g. pair (d, 0), (d, 1), (d, 2), (d, 3), (d, 0), (d, 1), (d, 2), (d, 3). The 8 pairs can be divided into 2 groups.

1,0 1,0 1,0 0,0 0,0 0,0 The first group includes 6 pairs (d, 0), (d, 1), (d, 3), (d, 0), (d, 1), (d, 3). With this scheme, 5 occasions could be allocated for the first group.

1,0 0,0 The second group includes pairs (d, 2), (d, 2). With this scheme, 2 occasions could be allocated for the first group.

Therefore, the Type1 HARQ-ACK codebook consists of 7 occasions.

Handling DCI Format 1_0 in Type1 HARQ-ACK Codebook

1,k In one embodiment, with Type1 HARQ-ACK codebook, the set of K1 is extended considering multiple PDSCHs can be scheduled by a DCI in multiple consecutive slots, and a DCI format 1_0 can be used to schedule PDSCH transmission with a value Kwhich belongs to the intersection of the set of slot timing values for DCI format 1_0, e.g. {1, 2, 3, 4, 5, 6, 7, 8} in NR, and the extended set of K1.

4 FIG. For example, in, if set of K1 is considered, the applicable slot timing values for DCI format 10 is {2, 3, 5}. On the other hand, if extended set of K1 is considered, the applicable lot timing values for DCI format 1_0 is {2, 3, 4, 5, 6, 7, 8}.

Various embodiments herein provide techniques for HARQ-ACK transmission assuming multiple PDSCHs can be scheduled by a DCI. Embodiments include techniques to generate a semi-static HARQ-ACK codebook for multi-PDSCH scheduling in system operating above 52.6 GHz carrier frequency, considering potential limitation on the multi-PDSCH scheduling for codebook size reduction.

A DCI may be able to schedule one or more PDSCHs with separate TBs. The number of scheduled PDSCHs by the DCI may be explicitly indicated by a field in the DCI. Alternatively, the number of scheduled PDSCHs by the DCI is jointly coded with other information field(s). For example, the number of scheduled PDSCHs for a row in a time domain resource allocation (TDRA) table equals to the number of configured SLIVs of the row. The maximum number of PDSCHs scheduled by a multi-TTI DCI is the maximum number of scheduled PDSCHs among all rows. For a row of TDRA table, each SLIV can be configured in a different slot. Alternatively, one or more SLIVs may be configured in the same slot.

For the Type1 HARQ-ACK codebook in NR, a set of occasions for candidate PDSCH reception are determined based on the configured set of slot timing values K1, the configured TDD UL-DL configurations (e.g. TDD UL-DL configurationCommon and TDD UL-DL configurationDedicated) and the time domain resource allocation (e.g. SLIV) table(s). Depending on UE capability, the number of occasions for a slot associated with a value n-K1 is either up to 1 or determined by non-overlapped SLIVs in the slot.

Type1 HARQ-ACK codebook could be extended to support HARQ-ACK feedback for the multiple PDSCHs scheduled by a multi-PDSCH DCI. It is necessary to include the HARQ-ACK bit(s) for all the potential PDSCHs indicated by the SLIVs of a row in the TDRA table. On the other hand, multiple limitation factors on the multi-PDSCH scheduling can be used to reduce the codebook size.

The PDSCH Transmissions Scheduled by Different DCI are not Interleaved

For the multi-PDSCH scheduling, the timing relation between the PDCCHs and the scheduled PDSCHs can be defined in the following way: in a given scheduled cell, the UE is not expected that, a first PDSCH, that is scheduled with a second PDCCH, starts earlier than the end of the last PDSCH that is scheduled by a first PDCCH, and a first PDSCH, that is scheduled with the first PDCCH, starts earlier than the end of the last PDSCH that is scheduled by the second PDCCH. By this way, the PDSCH(s) scheduled by a first DCI cannot be interleaved with the PDSCH(s) scheduled by a second DCI.

12 FIG. illustrates one example for the valid and invalid multi-PDSCH scheduling by two PDCCHs. Based on the above timing relation 1202 is considered as valid scheduling, while timing relation 1204 is invalid scheduling.

1,k U 1,k U 1,k μ DL -μ DL μ DL -μ UL Corresponding to a value Kin the set of K1, one or more ending DL slots for the PDSCH transmissions can be determined. For the HARQ-ACK transmission in UL slot nand value K, PDSCH transmission(s) can be ended in DL slots └n−K)·2┘+j, j=0, 1, . . . , ┌2┐−1. Then, the set of the DL slots that can be used for PDSCH transmissions can be determined by all the determined ending DL slots corresponding to all the values in the set of K1. The occasions for candidate PDSCH receptions can be allocated for each determined DL slot respectively and concatenated.

k,j 1,k k,j 1,k U 1,k U k,j k,j k,j μ DL -μ DL set of pairs (d,r) can be determined for each DL slot that is determined by a value Kin the set of K1. A pair (d,r) indicates the PDSCH transmissions that can be scheduled by a DCI indicating a row r in TDRA table and value Kand ends in DL slot └n−K)·2┘+j. For HARQ-ACK transmission in slot n, the corresponding set of pairs for a determined DL slot only include a pair (d,r) if at least one of the PDSCH transmissions that are associated with the pair (d,r) is mapped to the determined DL slot. The set of pairs for a determined DL slot may be further limited to only include a pair (d,r) if the pair contains a SLIV that is mapped to the determined DL slot and is not overlapped with any UL symbol in the determined DL slot according to the semi-static TDD UL-DL configuration, if configured.

11 FIG. illustrates one example of the configuration of set of K1 and set of rows in TDRA table. It assumes that the SCS for PUCCH transmission and the PDSCH transmission is the same. In this example, the set of K1 have 2 values 2 and 3. The TDRA table include 4 rows. The first row has 5 SLIVs which are allocated in 4 consecutive slots, e.g. SLIV {0-0, 0-1, 0-2, 0-3, 0-4}. The second row has 3 SLIVs in three consecutive slots, e.g. SLIV {1-0, 1-1, 1-2}. The third row has 2 SLIVs in two consecutive slots, e.g. SLIV {2-0, 2-1}. the fourth row has single SLIV, e.g. SLIV {3-0}. Corresponding to HARQ-ACK transmission in slot n, the ending DL slots that are determined by the set of K1 is slot n-3 and n-2. All the DL slots for PDSCH transmission are from slot n-6 to slot n-2.

In one embodiment, for a determined non-ending slot, the number of allocated occasions equals to the maximum number of SLIV(s) that are available for PDSCH transmission in the determined non-ending DL slot among all the pairs of the determined non-ending DL slot. A SLIV in a slot is considered available for PDSCH transmission if the SLIV is not overlapped with any UL symbol in the slot according to the semi-static TDD UL-DL configuration, if configured.

11 FIG. In, the number of occasions that are allocated for the determined non-ending DL slot n-6, n-5, n-4 are 1, 1, 2 respectively.

k,j Specifically, if only one SLIV can be configured in a slot for each row in the TDRA table, one occasion can be allocated for a determined non-ending slot, if at least one SLIV from the set of pairs (d,r) for the determined non-ending slot is available for PDSCH transmission in the determined non-ending slot. Otherwise, no occasion is allocated for the determined non-ending slot.

k,j 11 FIG. In one embodiment, based on the set of pairs (d,r) for a determined ending slot, a set of SLIVs that indicate PDSCH transmissions in the determined ending slot are obtained. For example, in, the set of SLIVs for slot n-3 include SLIV 0-2, 0-3, 1-1, 2-0, 0-4, 1-2, 2-1 and 3-0. Then, the occasions can be generated by the set of determined DL slots, the corresponding set of SLIVs for each determined DL slot and the semi-static TDD UL-DL configuration. The existing procedure for Type1 HARQ-ACK codebook generation in NR can be reused to generate occasions for each DL slot assuming the corresponding set of SLIVs of the DL slot.

k,j In one embodiment, based on the set of pairs (d,r) for a determined ending slot, a set of SLIVs that are available for PDSCH transmissions in the determined ending slot are obtained according to the semi-static TDD UL-DL configuration. A SLIV in a slot is considered available for PDSCH transmission if the SLIV is not overlapped with any UL symbol in the slot according to the semi-static TDD UL-DL configuration, if configured. Then, the occasions can be generated by the set of determined DL slots, the corresponding set of SLIVs for each determined DL slot. The existing procedure for Type1 HARQ-ACK codebook generation in NR can be reused to generate occasions for each DL slot assuming the corresponding set of SLIVs of the DL slot.

k,j In one embodiment, for a determined ending slot, the set of pairs (d,r) are divided into one or multiple groups. Then, the occasion(s) are allocated for each group of pairs respectively. For any two pairs in a group, at least one SLIV of a first pair is overlapped with the SLIV(s) of a second pair.

The pairs for a determined ending slot can be categorized into 4 types:

0,0 0,0 0,0 11 FIG. Type1 pair: a pair that is configured in multiple slots and ends in the determined ending DL slot. For example, pair (d, 0), (d, 1), (d, 2) for slot n-3 in.

1,0 11 FIG. Type2 pair: a pair that is configured in multiple slots and starts from the determined ending DL slot. For example, pair (d, 2) for slot n-3 in.

1,0 1,0 11 FIG. Type3 pair: a pair starts in a slot before the determined ending DL slot and ends in a slot after the determined ending DL slot. For example, pair (d, 0), (d, 1) for slot n-3 in.

0,0 11 FIG. Type4 pair: a pair that is only configured in the determined ending DL slot. For example, pair (d, 3) for slot n-3 in.

All overlapped pairs can share the same occasion(s) All Type1 pairs can share the same occasion(s) All Type2 pairs can share the same occasion(s) All Type3 pairs can share the same occasion(s) and can share the occasions with any other types of pairs One or more of the following principles can be considered in the grouping of pairs in a determined ending DL slot:

If the ending OFDM symbol index of a Type1 pair in the determined ending DL slot is not earlier than the starting OFDM symbol index of a Type4 pair, the Type1 pair and the Type4 pair can share the same occasion(s)

If the starting OFDM symbol index of a Type2 pair in the determined ending DL slot is not later than the ending OFDM symbol index of a Type4 pair, the Type2 pair and the Type4 pair can share the same occasion(s)

If the ending OFDM symbol index of a Type1 pair in the determined ending DL slot is not earlier than the starting OFDM symbol index of a Type2 pair in the determined ending DL slot, the Type1 pair and the Type2 pair can share the same occasion(s)

11 FIG. In, based on the above principles, the number of occasions that are allocated for the determined non-ending DL slot n-3, n-2 can be 3, 2 respectively.

In one option, if at most one SLIV can be configured in a slot for each row in the TDRA table, a pair belongs to only one group. One occasion can be allocated for a group, if at least one SLIV from the group of pairs for the determined ending slot is available for PDSCH transmission in the determined ending slot. Otherwise, no occasion is allocated for the group.

In one option, a pair only belongs to a group. For the determined ending DL slot, the occasion(s) are allocated for each group of pairs respectively. For a group, the number of allocated occasions equals to the maximum number of SLIV(s) that is available for PDSCH transmission in the determined ending DL slot among all the pairs in the group.

In another option, if a pair contains N SLIVs that are available for PDSCH transmissions in the determined ending DL slot, the pair is treated as N pairs which respectively contain the N SLIVs in the determined ending DL slot, N≥1. The SLIVs in slots other than the determined ending DL slot for the pair commonly apply to the N pairs. Consequently, the pair belongs to N groups. For the determined ending DL slot, one occasion is allocated for each group of pairs respectively. For the pair containing N SLIVs in the determined ending DL slot, the N occasions determined for the N groups are respectively used to carry HARQ-ACK of the N SLIVs.

In another option, if a pair contains N SLIVs that are available for PDSCH transmissions in the determined ending DL slot, the pair is grouped into N groups which are respectively used to allocate the occasions for the N SLIVs, N≥1. To check the overlap between the pair with N SLIVs and another pair, all the N SLIVs can be considered. For the determined ending DL slot, one occasion is allocated for each group of pairs respectively. For the pair containing N SLIVs in the determined ending DL slot, the N occasions determined for the N groups are respectively used to carry HARQ-ACK of the N SLIVs.

In the above options, the UE can iteratively do the following procedure until all pairs in the set of pairs are grouped for a determined ending slot. To generate a group of pairs, a pair with smallest last OFDM symbol index in the determined ending DL slot among all remaining pairs is determined and added to the group. Then any pair that overlaps with all pairs in the group is added to the group.

Step 1: a pair with smallest last OFDM symbol index in the determined ending DL slot among all remaining pairs is determined and is used to generate a group. The following rules are used to do the grouping, A Type1 pair is considered overlap with all other pairs and is added to the group A pair that overlap with all pairs in the group is added to the group Step 2: a pair with largest start OFDM symbol index in the determined ending DL slot among all remaining pairs is determined and is used to generate a group. The following rules are used to do the grouping, A Type2 pair is considered overlap with all other pairs and is added to the group A pair that overlap with all pairs in the group In the above options, the UE can iteratively do the following procedure until all pairs in the set of pairs are grouped.

Step 1: a pair with smallest last OFDM symbol index in the determined ending DL slot among all remaining pairs is determined and is used to generate a group. The following rules are used to do the grouping, A Type1 pair is considered overlap with all other pairs and is added to the group A Type3 pair is considered overlap with all other pairs and is added to the group A pair that overlap with all pairs in the group is added to the group Step 2: a pair with largest start OFDM symbol index in the determined ending DL slot among all remaining pairs is determined and is used to generate a group. The following rules are used to do the grouping, A Type2 pair is considered overlap with all other pairs and is added to the group A Type3 pair is considered overlap with all other pairs and is added to the group A pair that overlap with all pairs in the group In the above options, the UE can iteratively do the following procedure until all pairs in the set of pairs are grouped.

Step 1: a pair with smallest last OFDM symbol index m in the determined ending DL slot is determined among all remaining Type1/3/4 pairs and is used to generate a group. The following rules are used to do the grouping, A Type1 pair is considered overlap with all other pairs and is added to the group A Type3 pair is considered overlap with all other pairs and is added to the group A pair that overlap with all pairs in the group is added to the group For a Type2 pair, if the first OFDM symbol index of the pair in the determined ending DL slot is not larger than m, the pair is considered overlap with all other pairs and is added to the group Step 2: a pair with largest start OFDM symbol index m in the determined ending DL slot is determined among all remaining Type2/3/4 pairs and is used to generate a group. The following rules are used to do the grouping, A Type2 pair is considered overlap with all other pairs and is added to the group A Type3 pair is considered overlap with all other pairs and is added to the group A pair that overlap with all pairs in the group For a Type1 pair, if the last OFDM symbol index of the pair in the determined ending DL slot is not less than m, the pair is considered overlap with all other pairs and is added to the group In the above options, the UE can iteratively do the following procedure until all pairs in the set of pairs are grouped.

Step 1: a pair with smallest last OFDM symbol index m in the determined ending DL slot is determined among all remaining Type1 or Type4 pairs and is used to generate a group. The following rules are used to do the grouping, A Type1 pair is added to the group A Type3 pair is added to the group For a Type4 pair, if the first symbol index of the pair in the determined ending DL slot is not larger than m, the pair is added to the group For a Type2 pair, if the first symbol index of the pair in the determined ending DL slot is not larger than m, the pair is added to the group Step 2: a pair with largest start OFDM symbol index m in the determined ending DL slot is determined among all remaining Type2 or Type4 pairs and is used to generate a group. The following rules are used to do the grouping, A Type2 pair is added to the group A Type3 pair is added to the group For a Type4 pair, if the last OFDM symbol index of the pair in the determined ending DL slot is not less than m, the pair is added to the group Step 3: the remaining pairs in Step 3, if existed, are Type3 or Type4 pairs. If the remaining pairs are Type3 pairs. All remaining Type3 pairs belong to one group. Otherwise, the UE can iteratively run the following procedure until all remaining Type4 pairs are grouped. a pair with smallest last OFDM symbol index m in the determined ending DL slot is determined among all remaining Type4 pairs and is used to generate a group. For a Type4 pair, if the first symbol index of the pair in the determined ending DL slot is not larger than m, the pair is added to the groupAt Most One PDSCH can be Scheduled in a Slot In the above options, the UE can group the set of pairs using the following procedure.

For the multi-PDSCH scheduling, a UE may support at most one scheduled PDSCH in a slot. Such rule can be used for Type1 HARQ-ACK codebook size reduction.

1,k U 1,k U 1,k μ DL -μ DL μ DL -μ DL Corresponding to a value Kin the set of K1, one or more ending DL slots for the PDSCH transmissions can be determined. For the HARQ-ACK transmission in UL slot nand value K, PDSCH transmission(s) can be ended in DL slots └n−K)·2┘+j, j=0, 1, . . . , ┌2┐−1. Then, the set of the DL slots that can be used for PDSCH transmissions can be determined by all the determined ending DL slots corresponding to all the values in the set of K1. Up to one occasion for candidate PDSCH reception can be allocated for each determined DL slot respectively and concatenated.

k,j k,j 1,k 1,k k,j k,j 1,k 1,k U 1,k U 1,k U U k,j k,j k,j k,j k,j k,j k,j k,j k,j k,j μ DL -μ DL μ UL A set of pairs (d,r d,r) can be determined for each DL slot that is determined by a value KKin the set of K1. A pair (d,r d,r) indicates the PDSCH transmissions that can be scheduled by a DCI indicating a row r in TDRA table and value KKand ends in DL slot └n−K)·2┘+j└n−K)·2┘. For HARQ-ACK transmission in slot nn, the corresponding set of pairs for a determined DL slot only include a pair (d,r d,r) if at least one of the PDSCH transmissions that are associated with the pair (d,r d,r) (d,r d,r) is mapped to the determined DL slot. One occasion can be allocated for a determined DL slot, if at least one SLIV from the set of pairs (d,r d,r) (d,r d,r) for the determined DL slot is available for PDSCH transmission in the determined DL slot. Otherwise, no occasion is allocated for the determined DL slot.

k,j k,j The set of pairs for a determined DL slot may be further limited to only include a pair (d,r d,r) if the pair contains a SLIV that is mapped to the determined DL slot and is not overlapped with any UL symbol in the determined DL slot according to the semi-static TDD UL-DL configuration, if configured. For a determined DL slot, if there is at least one pair in the set of pairs for the determined DL slot, one occasion is allocated for the determined DL slot. Otherwise, no occasion is allocated for the determined DL slot.

The Abstract is provided to comply with 37 C.F.R. Section 1.72(b) requiring an abstract that will allow the reader to ascertain the nature and gist of the technical disclosure. It is submitted with the understanding that it will not be used to limit or interpret the scope or meaning of the claims. The following claims are hereby incorporated into the detailed description, with each claim standing on its own as a separate embodiment.